The crystal structure of Cu 6 AsS 5 I crystal have been analyzed and described by using the superspace symmetry concept. The program operating under the Maple environment and suitable for theoretically calculating the phonon spectra of Cu 6 AsS 5 I crystal has been developed. The eigenvalues of the generalized dynamic matrix have been found as well as the dispersion dependencies have been built for the directions Г-X-M-R-Г-M of the Brillouin zone.
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